I ask the question because I am not good at boost::statechart and I can't get answer from other way. To help me to good understand the PG statechart, I hope someone answer below questions: In Initial state, 1. why there is not react function for custom_reaction< NullEvt > 2. why there is not custom_reaction definition about boost::statechart::result react(const MNotifyRec&); Regards Vincent -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html